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<a href="fast__math_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/**************************************************************************/</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="preprocessor">#include &quot;<a class="code" href="fast__math_8h.html">fast_math.h</a>&quot;</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span> </div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"><a class="line" href="fast__math_8c.html#a4efa9d728789fa7109f4250033e6e7b1">   15</a></span><span class="keyword">const</span> <span class="keywordtype">float</span> <a class="code hl_variable" href="fast__math_8c.html#a4efa9d728789fa7109f4250033e6e7b1">sin_tab</a>[] = {</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>    -0.41719f, -0.40599f, -0.39472f, -0.38339f, -0.37201f, -0.36057f, -0.34907f, -0.33752f, -0.32592f, -0.31427f,</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>    -0.30258f, -0.29084f, -0.27905f, -0.26722f, -0.25535f, -0.24345f, -0.2315f, -0.21952f, -0.20751f, -0.19547f,</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>    -0.18339f, -0.17129f, -0.15917f, -0.14702f, -0.13484f, -0.12265f, -0.11044f, -0.098208f, -0.085965f, -0.073708f,</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>    -0.061441f, -0.049164f, -0.036879f, -0.024589f, -0.012296f, 0</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>};</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"><a class="line" href="fast__math_8c.html#a5af7fb1bc56e2917540c1322b1ddb480">   72</a></span><span class="keywordtype">float</span> <a class="code hl_function" href="fast__math_8c.html#a5af7fb1bc56e2917540c1322b1ddb480">fast_sin</a>(<span class="keywordtype">float</span> theta) {</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span>    <span class="comment">/* congruence of angle theta to 2pi */</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>    <span class="keywordflow">while</span> (1) {</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>        <span class="keywordflow">if</span> (theta &gt; 6.2831854f &amp;&amp; theta &gt; 0)</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>            theta = theta - 6.2831854f;</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (theta &lt; 0)</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>            theta = theta + 6.2831854f;</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>        <span class="keywordflow">else</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>            <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>    }</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>    <span class="comment">/* look up the table to obtain the sine value */</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>    <span class="keywordflow">return</span> <a class="code hl_variable" href="fast__math_8c.html#a4efa9d728789fa7109f4250033e6e7b1">sin_tab</a>[(int) (81.4873308f * theta)];</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>}</div>
<div class="ttc" id="afast__math_8c_html_a4efa9d728789fa7109f4250033e6e7b1"><div class="ttname"><a href="fast__math_8c.html#a4efa9d728789fa7109f4250033e6e7b1">sin_tab</a></div><div class="ttdeci">const float sin_tab[]</div><div class="ttdoc">fast sine function lookup table</div><div class="ttdef"><b>Definition:</b> <a href="fast__math_8c_source.html#l00015">fast_math.c:15</a></div></div>
<div class="ttc" id="afast__math_8c_html_a5af7fb1bc56e2917540c1322b1ddb480"><div class="ttname"><a href="fast__math_8c.html#a5af7fb1bc56e2917540c1322b1ddb480">fast_sin</a></div><div class="ttdeci">float fast_sin(float theta)</div><div class="ttdoc">fast calculation of sine</div><div class="ttdef"><b>Definition:</b> <a href="fast__math_8c_source.html#l00072">fast_math.c:72</a></div></div>
<div class="ttc" id="afast__math_8h_html"><div class="ttname"><a href="fast__math_8h.html">fast_math.h</a></div><div class="ttdoc">this is the header file of fast_math.c, the macros of fast amplitude limiting algorithm and cosine fu...</div></div>
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